Harrow.



Nn. 644,046. Patented Feb. 27, |000. J. H., 0. T. a E. 0. ALBRIGHT.

H A R R 0 W (Application lsd Deo. 2, 1899.)

(No K000i.)

UNITED STATES PATENT OFFICE.

JAMES H. ALBRIGIIT, DANIEL T. ALBRIGHT, AND EMERSON D. ALBRIGHT, OFMIFFLINBURG, PENNSYLVANIA.

HARROW.

SPECIFICATION forming part of Letters Patent No. 644,046, dated February27, 1900.

Original application iiled December 29, 1898, Serial No. 700,382.Divided and this application filed December 2, 1899. Serial No. 739,023. (No model.)

To @ZZ whom t may concern:

Be it known thatwe, JAMES H. ALBRIGIIT, DANIEL T. ALBEIGII'I, andEMERSON D. AL- BRIGHT, citizens of the United States, residing atMiffiinburg, in the county of Union and State of Pennsylvania., haveinvented a new and useful Harrow, of which the following is aspecification.

The subject-matter of this application con- Io stitutes a division ofthe prior application for improvements in harrows filed by us December29, 1898, Serial No. 700,382.

The invention embraced in this application relates to means for clampingan earth-treating device, such as a barrow-tooth, to its supporting baror shaft; and the object in View is to provide a simple construction bywhich the tooth is held firmly in place, notwithstanding any looseningof the nut on the faszo tening-bolt, thus providing a Acompensatingclamp which overcomes any tendency of the tooth to become displaced onits support.

With this end in view the invention consists in the combination, with abar or shaft, of a tooth having a curved arm, a bolt, and an archedyieldable clamp in active relation to the arm of said tooth and to saidbolt, the radius of the arched clamp being less than the curvature ofthe tooth-arm.

The invention further consists in the combination of a shaft or bar, atooth having a bearing thereon, a bolt passing through the tooth and theshaft, and a permanently-elastic clamp interposed between a nut on thebolt and said tooth, the radius of the springclamp being less than thecurvature of 'the tooth.

The invention further consists of a shaft or bar having a circularcross-sectional outline and a transverse opening and an earthtreatingdevice having a curved arm to fit against the shaft or bar and providedwith a longitudinal slot in the curved portion,in combination with abolt passing th rough the openl ing of the shaft and a slot of the armand 'a spring-clamp of less radius than the curved portion of the armand interposed between it and the clamping portion of the bolt, saidspring-clamp overlapping and concealing the 5o longitudinal slot of thecurved arm.

In the drawings, Figure 1 is a plan View of .a harrow or of a portion ofa harrow with which our improvements are combined. Fig.

2 is an enlarged detail sectional view through the bearing end of aspring-tooth, the shaft or bar for supporting the tooth, and thefastening device for the tooth. Fig. 3 is a view similar to Fig. 2,illustrating the action of the spring-clamp when theV nut of the boltWorks loose.

Like numerals of reference are used to indicate like and correspondingparts in each of the several figures of the drawings.

In Fig. 1 we have illustrated a portion of a harrow forming thesubject-matter of our original application, of which the presentapplication is a division; but it is to be understood that the structureshown by said figure may constitute the harrow itself. In said iigure ofthe drawings the numeral 11 is used to 7o indicate a frame or a partthereof, and this frame supports a series of transverse toothsupportingshafts or bars 17, the same being mounted to rock or turn in bearings29,Which are applied to the opposing faces on the sides of the frame 1l.These shafts or bars carry the series of teeth 36, which are arranged instaggered relation; but the order or arrangement and the number of teethis not material. The shafts or bars 17 are provided with '8o short arms18, and to the arms of the series of bars is connected pivotally theadjustingrod 19, the latter carrying a segment 20,Which is adapted tobeengaged by a locking device on the adjusting-lever 21. In the rearpart 85 of the frame is an axle 23, provided with the wheel 24., and inthe front part of the frame is a shoe 27. It is optional whether a shoeor a caster-wheel is employed to sustain the front end of the frame. o

The improvement which constitutes the subject-matter of the presentinvention resides in the means for firmly holding each springtooth onthe shaft or bar 17 in a manner to compensate for looseness of the nuton the fastening-bolt. Each tooth has its upper end curved to form abearing-arm 37, which conforms accurately to the contour of the shaft orbar 17. The curved arm of the tooth is provided with a longitudinal slot38, and the Ioo fastening-bolt 39 passes transversely and centrall ythrough the shaft or bar 17 and through the slot 3S in the curvedbearing-arm of the tooth. The head 40 of the bolt bears against thewasher 4l, which is interposed between the face of the shaft or bar andthe head of the bolt, although this washer may be omitted. The threadedextremity of the bolt, which protrudes beyond the curved bearingarm ofthe tooth, receives a-clamping-nut 42, and between said nut and thecurved slotted arm 37 of the toothv is interposed an elastic or springclamp 4.3, the latter having a transverse opening for the passagetherethrough of the threaded end of the bolt. This clamp is made orstruck up from a single piece of elastic metal, and it is necessarilysegmental or arched in longitudinal section. The radius of thespring-clamp is less than that of the curved bearing-arm 87of thespring-tooth, and when the tooth and the clamp are assembled inoperative relation to the bar or shaft and to the fastening-bolt thiselastic arched clamp does not conform accurately to the curvature of thebearing-arm on the tooth. The nut 42 is designed to be turned on thethreaded end of the bolt for the purpose of compressing the elasticclamp, so as to make the latter bear iirmly upon the curved arm of thetooth, the resiliency of said clamp causing it to press against both thearm of the tooth and the nut of the bolt. If the nut works loose on thebolt, the clamp by its inherent elasticity presses against the nut andsaid arm of the tooth, and the strength of the clamp is sul'licient tobind the arm of said tooth against the shaft or bar for the purpose ofholding` the tooth in proper position thereon, notwithstanding theaccidental movement of the nut 42 away from the arm of the tooth and theshaft or bar.

The opening in the clamp through which the bolt passes corresponds tothe cross-sectional area of said bolt, so as not to leave a spacetherebetween, and the clamp is thus adapted to close the outer open sideof the slot 38 and prevent the entrance of dirt and foreign mattertherein. It is evident that the lodgment of dirt in the slot would tendto close the same; but the slot is closed -by the clamp under alladjustments of the arm 36, forming a part of the earth-treating deviceor tooth.

It will be understood that the slotted curved arm of the earth-treatingdevice permits a limited adjustment of said tooth or device around theshaft or bar, so that the position of the tooth may be changed accordingto the desired penetration. Each tooth is held firmly and rigidly on thebar or shaft by the bolt and the spring-clamp, and by having the clampact against the nut it minimizes the tendency of the nut to work looseon the bolt.

Vtfe do not limit ourselves to the employment of our improvement in theconstruction of the barrow shown by Fig. 1 or in our originalapplication, to which reference has been made, because it is evidentthat the improved construction may be employed in various types ofharrows and other agricultural inachinery.

Having thus described the invention, what we claim is- 1. Thecombination with a bar or shaft, of a tooth having a curved arm, a bolt,and an arched yieldable clamp in active relation to the arm of saidtooth and to said bolt, the radius of the arched clamp being less thanthe curvature of the tooth-arm.

2. The combination with a shaft or bal', a tooth having a bearingthereon, a bolt passing through the tooth and the shaft, and apermanently elastic clamp interposed between a nut on the bolt and saidtooth, the radius of the spring-clamp being less than thc curvature ofthe tooth.

3. The combination with a shaft or bar having a circular cross-sectionaloutline and a transverse opening, and an earthtreating device having acurved arm to tit against the shaft or bar and provided with alongitudinal slot in the curved portion, of a bolt passing through theopening of the shaft and a slot of the arm, and a spring-clamp of lessradius than the curved portion of the arm and interposed between it andthe clamping portion of the bolt, said spring-clamp overlapping andconcealing the longitudinal slot of the curved arm.

In testimony that we claim the foregoing as our own we have heretoaliixed our signatures in the presence of two witnesses.

JAMES H. ALBRIGHT. DANIEL T. ALBRIGHT. EMERSON D. ALBRIGHT. Witnesses:

CHESTER E. ALBRIGHT, GEO. F. SKELL.

IOO

